INT math is slow in SQL server, but only under VMware - really weird!

Hi

I had noticed a really strangle thing. INT calculation is 2-3-5 times slower in SQL server running in VMware than on physical machines. From VMware side, I had eliminated all possible things: balooning, CPU overconsumption, "ready" time etc. INT CPU tests (link 'Pi' digits calculation programs) show the same performance, while SQL server math operations are MUCH slower. 

Please check the test of few results on different machines. I am DBA for >20y, but I am really puzzled.

Test is simple, no parallelism, no IO, limited memory use (L2,L3 caching is irrelevant)

Results

create function dbo.isPrime (@n bigint)
returns int
as
  begin
  if @n = 1 return 0
  if @n = 2 return 1
  if @n = 3 return 1
  if @n % 2 = 0 return 0
  declare @sq int
  set @sq = sqrt(@n)+1 -- check odds up to sqrt
  declare @dv int = 1
  while @dv < @sq 
    begin
	set @dv=@dv+2
	if @n % @dv = 0 return 0
	end
  return 1
  end
GO
declare @dt datetime set @dt=getdate()
select dbo.isPrime(1000000000000037)
select datediff(ms,@dt,getdate()) as ms
GO